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Federal Register / Vol. 86, No. 84 / Tuesday, May 4, 2021 / Rules and Regulations
3 Will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
Adoption of the Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows:
PART 39AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:

Authority: 49 U.S.C. 106g, 40113, 44701.
39.13

Amended
2. The FAA amends 39.13 by:
a. Removing Airworthiness Directive 20192210, Amendment 3919789 84
FR 61533, November 13, 2019; and b. Adding the following new airworthiness directive:

20210906 The Boeing Company:
Amendment 3921519; Docket No.
FAA20200789; Project Identifier AD
202000849T.
a Effective Date This airworthiness directive AD is effective June 8, 2021.
b Affected ADs This AD replaces AD 20192210, Amendment 3919789 84 FR 61533, November 13, 2019 AD 20192210.
c Applicability 1 This AD applies to all The Boeing Company Model 737600, 700, 700C, 800, 900, and 900ER series airplanes, certificated in any category.
2 Installation of Supplemental Type Certificate STC ST00830SE does not affect the ability to accomplish the actions required by this AD. Therefore, for airplanes on which STC ST00830SE is installed, a change in product alternative method of compliance AMOC approval request is not necessary to comply with the requirements of 14 CFR
39.17.

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d Subject Air Transport Association ATA of America Code 53, Fuselage.
e Unsafe Condition This AD was prompted by reports of cracking discovered in the station STA
663.75 frame fitting outboard chords and failsafe straps adjacent to the stringer S18A
straps and a determination that the initial inspection threshold for certain airplanes and the repetitive inspection interval specified in AD 20192210 are inadequate to address the
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cracking in a timely manner. The FAA is issuing this AD to address cracking in the STA 663.75 frame fitting outboard chords and failsafe straps adjacent to the stringer S
18A straps, which could result in failure of a Principal Structural Element PSE to sustain limit load. This condition could adversely affect the structural integrity of the airplane and result in loss of control of the airplane.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Retained Inspection and Corrective Action, With No Changes This paragraph restates the requirements of paragraph g of AD 20192210, with no changes. At the earlier of the times specified in paragraphs g1 and 2 of this AD: Do a detailed inspection for cracking of the leftand right-hand side outboard chords of the STA 663.75 frame fittings and failsafe straps adjacent to the stringer S 18A straps, in accordance with Boeing Multi-Operator Message MOMMOM19053601B, dated September 30, 2019. If any crack is found, repair before further flight using a method approved in accordance with the procedures specified in paragraph n of this AD. Repeat the inspection thereafter at intervals not to exceed 3,500 flight cycles until the initial inspection required by paragraph i of this AD is done.
1 Prior to the accumulation of 30,000
total flight cycles, or within 7 days after October 3, 2019 the effective date of AD
20192002, Amendment 3919755 84 FR
52754, October 3, 2019 AD 20192002, whichever occurs later.
2 Prior to the accumulation of 22,600
total flight cycles, or within 1,000 flight cycles after October 3, 2019 the effective date of AD 20192002, whichever occurs later.
h Retained Reporting Requirement, With No Changes This paragraph restates the requirements of paragraph h of AD 20192210, with no changes. At the applicable time specified in paragraph h1 or 2 of this AD, submit a report of all findings, positive and negative, of the initial inspection required by paragraph g of this AD. Submit the report in accordance with Boeing Multi-Operator Message MOMMOM19053601B, dated September 30, 2019.
1 If the inspection was done on or after October 3, 2019 the effective date of AD
20192002: Submit the report within 10
days after the inspection.
2 If the inspection was done before October 3, 2019 the effective date of AD
20192002: Submit the report within 10
days after October 3, 2019.
i Inspection and Corrective Action With Reduced Compliance Times Except as specified in paragraph j of this AD: At the applicable initial compliance time specified in Tables 1 and 2 of Ref I of Boeing Multi-Operator Message MOM
MOM20044301B R1, dated June 2, 2020, do a detailed inspection of the leftand right-

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hand side outboard chords of the STA 663.75
frame fittings and failsafe straps around eight fasteners adjacent to the stringer S18A
straps, in accordance with Boeing MultiOperator Message MOMMOM200443
01B R1, dated June 2, 2020. If any crack is found, repair before further flight using a method approved in accordance with the procedures specified in paragraph n of this AD. Repeat the inspection thereafter at the applicable intervals specified in Tables 1 and 2 of Ref I of Boeing Multi-Operator Message MOMMOM20044301B R1, dated June 2, 2020. Accomplishing the initial inspection required by this paragraph or an initial inspection specified in Boeing MultiOperator Message MOMMOM190623
01B, dated November 5, 2019, terminates the inspections required by paragraph g of this AD.
j Exceptions to Service Information Specifications Where Boeing Multi-Operator Message MOMMOM20044301B R1, dated June 2, 2020, uses the phrase the original issue date of MOMMOM20044301BR1, this AD requires using the effective date of this AD.
k New Reporting Requirement At the applicable time specified in paragraph k1 or 2 of this AD, submit a report of all findings, positive and negative, of the initial inspection required by paragraph i of this AD. Submit the report in accordance with MOMMOM200443
01B R1, dated June 2, 2020. A report submitted as specified in paragraph h of this AD is acceptable for compliance with the requirements of this paragraph.
1 If the inspection was done on or after the effective date of this AD: Submit the report within 10 days after the inspection.
2 If the inspection was done before the effective date of this AD: Submit the report within 10 days after the effective date of this AD.
l Special Flight Permit Special flight permits may be issued in accordance with 14 CFR 21.197 and 21.199
to operate the airplane to a location where the airplane can be repaired if any crack is found, provided the Manager, Seattle ACO
Branch, FAA, concurs with issuance of the special flight permit. Send requests for concurrence by email to 9-ANM-Seattle-ACOAMOC-Requests@faa.gov.
m Paperwork Reduction Act Burden Statement A federal agency may not conduct or sponsor, and a person is not required to respond to, nor shall a person be subject to a penalty for failure to comply with a collection of information subject to the requirements of the Paperwork Reduction Act unless that collection of information displays a current valid OMB Control Number. The OMB Control Number for this information collection is 21200056. Public reporting for this collection of information is estimated to be approximately 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed,
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